PPRuNe Forums - View Single Post - B737NG FMC options
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Old 17th March 2012 | 11:26
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Checkboard
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Joined: Aug 1998
: ATPL
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From: Ex-pat Aussie in the UK
When the fuel indicators fail you get an FMC message and the option then becomes available. When the signals are valid (i.e. normally), you can't update the fuel.
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